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Design and Implementation of Open MPI over Quadrics/Elan4

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4 Author(s)
Weikuan Yu ; Dept. of Comput. Sci. & Eng., Ohio State Univ., Columbus, OH, USA ; Woodall, T.S. ; Graham, R.L. ; Panda, D.K.

Open MPI is a project recently initiated to provide a fault-tolerant, multi-network capable implementation of MPI-2, based on experiences gained from FT-MPI, LA-MPI, LAM/MPI, and MVAPICH projects. Its initial communication architecture is layered on top of TCP/IP. In this paper, we have designed and implemented Open MPI point-to-point layer on top of a high-end interconnect, Quadrics/Elan4. The restriction of Quadrics static process model has been overcome to accommodate the requirement of MPI-2 dynamic process management. Quadrics Queued-based Direct Memory Access (QDMA) and Remote Direct Memory Access (RDMA) mechanisms have been integrated to form a low-overhead, high-performance transport layer. Lightweight asynchronous progress is made possible with a combination of Quadrics chained event and QDMA mechanisms. Experimental results indicate that the resulting point-to-point transport layer is able to achieve comparable performance to Quadrics native QDMA operations, from which it is derived. Our implementation provides an MPI-2 compliant message passing library over Quadrics/Elan4 with a performance comparable to MPICH-Quadrics.

Published in:

Parallel and Distributed Processing Symposium, 2005. Proceedings. 19th IEEE International

Date of Conference:

04-08 April 2005